Add type arguments to SyntheticInvocation.

test/wrapper_test.dart

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 /// Tests wrapper utilities.
 
 import "dart:collection";
 import "package:collection/collection.dart";
 import "package:test/test.dart";
 
@@ skipping 42 matching lines @@
 class SyntheticInvocation implements Invocation {
   static const int METHOD = 0x00;
   static const int GETTER = 0x01;
   static const int SETTER = 0x02;
   final Symbol memberName;
   final List positionalArguments;
   final Map<Symbol, dynamic> namedArguments;
   final int _type;
   const SyntheticInvocation(this.memberName, this.positionalArguments,
       this.namedArguments, this._type);
+
+  List<Type> get typeArguments => const <Type>[];
+
   bool get isMethod => _type == METHOD;
 
   bool get isGetter => _type == GETTER;
 
   bool get isSetter => _type == SETTER;
 
   bool get isAccessor => isGetter || isSetter;
 }
 
 // Parameterization of noSuchMethod.
@@ skipping 579 matching lines @@
 
     test(".retainWhere", () {
       map["f"] = "foo";
       map["b"] = "bar";
       map["q"] = "qoo";
       set.retainWhere((element) => element.endsWith("o"));
       expect(map, equals({"f": "foo", "q": "qoo"}));
     });
   });
 }